Usually U Tubers only show their successful repairs which they figured out themselves. This time it was all different - I can really feel what it's like to scratch one's head over a super complicated issue. Good you have such a faithful and gifted friend you could call !!!! Carry on with the good videos.
"Welcome to the south main auto channel" haha watch you both along with many others all the time. Helps me out with my day to day diagnosing. Shout out from Alberta Canada!
Nice that you give Eric O the credit. I have the same issue in my Silverado. I made a note: Serial Data Communication Enable S/B 12V - according to Tim the Car Doctor!!
You might have just saved me fron a misdiagnosis. I was called to a body shop to diagnose a no com for the abs on a 2015 chevy tahoe. Everything looked good power, grounds and com lines. I called the module being bad 2 hrs ago. When I was looking up the abs diagram I couldn't find a wake up signal or a key on voltage. So I seen that enable com line wire and couldn't figure out what it was for. After Googleing "abs chevy no com, abs wake up" your video popped up. Thankfully there's awesome people like you to post gems like this. I could of hurt my reputation if I made the wrong call plus I would of been out a few bucks (my reputation is very important). I'll let you know tomorrow if it was that enable wire. I have a strong feeling it is because everything looked good.
What a mission. At least it ended with a great video. Trust Eric to come up with the answer. Given the garbage that comes through his door he gets the opportunity to see more problems than you would.
car doctor your the man eric o is the man and now car is fixed and we all work as one thats why i watch this this group of people snanner danner mr o car doctor pine hollow joes auto electrical omg keith is the boss of all of us his son we be taking over our jobs soon mr rock-o sorry if not spelled right thank you car doctor great vid jr reagan tn
I have an '04 Express with the 1000 code for no communication. I bet this is the problem. I went through every ground, replaced the brake control module, and didn't know where to go from there. Started out with many codes. Now over 25K miles driven with just the one code left. Now I have something to go on! Thanks!
Good job Doc. I an going through this right now. 02 Chev 2500HD. U1041 loss of comm to ebcm. I feel you. What a headache. Shows failure on supplemental inflatable restraint. Hoping to find bad data line connection between the two.
INSANE...is the state I was about at by the time it was finally fixed. Not sure im super impressed with GM's wiring and connectors lately. Good for business I guess. haha
hi tim....yea those abs modules go bad all the time can bus high and low and the wake up 12 v ...at chevy i just launched them in the attaching screws were a problem....you had a curve ball on this one! yea that dr o! hes from my neck of the woods....the man is good! if i called him dont think he would answer but at school ill get a chance to meet him
That's crazy this is the same problem I am having but with an 08 diesel 2500 van I have checked all the powers and grounds going to the ebcm they all will illuminate a headlight I have checked the data bus have 2.5 volts on all four of the communication wires my wake up signal was there died with a load I replaced the body control module and everything was programmed still would not wake up the ebcm so I am going to check this splice tomorrow thank you for the information this is very helpful
So my question is, how do you find that information about the LT Blue being a “wake up” signal. I have Mitchell ProDemend, but I can’t find that information anywhere.
I have 2018 gmc with service stabilitrac lite on U0077, U0126, U0151. I have looked for the WB wire on the Drivers and passengers side sill plates also the rear spare tire area. Going to do some back probing tomorrow 😌
I think that's my problem after spending hundreds if dollars at various shops with no communication to EBCM which needed to be replaced. Now the new one needs to be programmed to suit my vehicle. After spending time at the GM dealership the Tech cannot communicate with the EBCM to do any programming. So that was a waste of my money for parts (new module that needs programming) and labour. Now testing the blue wire on the third connection of Pcm I get no voltage with key on. Where would I go from here?
What does it mean when you get a U0121 DTC every now and then in a car without ABS? There's no ABS module to communicate with! Logically you'd think the PCM would either set this code every time I turn the key on or, ideally, not at all, because it shouldn't be trying to communicate with a module that isn't there! Something must be triggering the PCM to look for an ABS module, but only on extremely rare occasions, but what would do that, and is there any way to fix it? It's really annoying when it does this, because I don't know why the engine light is on and have to take it seriously until I can get out my scan tool and check the code.
Question being on the diagram I saw something related to the transmission I have code u1826-00 could this wiring issue (possible wire break) be the cause of my transmission acting up ?
That's one difficult problem to diagnose and fix, I am an auto mechanic with 30 years experience I have fix lot's of electronic electrical problems, I have taken a lot of fuel injection electronic courses and I am ASE certified. That's a very difficult problem to fix.
Well I do have battery voltage at the blue wire on the blue BCM connection. Also tested the light blue wire at the EBCM connection harness grounding it to frame bolt and got the same battery voltage, so this wire is okay. But when grounded to heavy back wire on EBCM harness the meter showed 5 or 6 volts then settled down to .075 volt on either of the harness large black wires..Then this weird thing happened. Got a high 5 volts on the meter with only one black lead connected to the heavy black wire with red lead not connected to anything it showed a . I will need to try another multimeter when it's not so wet outside. Anyway the EBCM should be enabled with getting battery voltage on the light ble wire known on my schematic as serial data enabled. The two heavy black and red wires are getting full battery voltage when tested across the EBCM harness. I really thought this was used to operate the module, but maybe just the pump with internal connection. But why are there two two sets of each? Getting back to enabling the EBCM
Countless hrs finding the broken wire, 5 minutes fixing it. Happens to me all the time. Most mechanics would throw their hat in and send the customer to the "needs an computer" shop to be absolutely raped. Thank you for your persistence.
yes. IM sure there are some folks that would figure it our but this above most shops pay grade around here. It would have been more enjoyable if I wasnt totally slammed with work already. I did learn a lot.
I have problem with transmission on my GMC envoy 2009 model. It's jerks while changing 1st gear to 2nd gear. Computer shows the code P0717.00 input sensor circuit low voltage. I have reset that code. But after 2 days it's reappearing. Now what I have to do? Please guide me. Thanks
@@ThecardoctorTV Thanks for your reply. Yesterday I have checked with transmission shop and they have told me to replace the valve body on the transmission box.
Feel your pain about what to charge the customer, back when I had my own business (medical electronics) would end up writing off half the labor bill sometimes. Glad you were able go get some good help.
@@alvarogomes3372 i can make you an appointment for the week after next and if you start driving now you should be able to make it. 😂 haha. Thank you for watching!
Eric often says ' Check the grounds and supplys ' , but Enable wires are another sneaky and easy missed signal. Eric also says ' That's your problem lady ' even if the owner is a man!!, i think he needs glasses :-D. Like yourself, eric is a decent man that looks after his customers. There are too many greedy ripp off merchants thease days :-(
You lost me as soon as you pulled out the wiring schematic... I'm watching a video for a reason, show me how to do it, don't show me a repair manual that shows me how to do it...
Usually U Tubers only show their successful repairs which they figured out themselves. This time it was all different - I can really feel what it's like to scratch one's head over a super complicated issue. Good you have such a faithful and gifted friend you could call !!!! Carry on with the good videos.
SMA and the Car Doctor are my main sources of automotive information. Thank you so much. GOD bless you
Both great choices!
Eric O is awesome. Glad you guys got the no-comms problem figured out!
"Welcome to the south main auto channel" haha watch you both along with many others all the time. Helps me out with my day to day diagnosing. Shout out from Alberta Canada!
Nice that you give Eric O the credit. I have the same issue in my Silverado. I made a note: Serial Data Communication Enable S/B 12V - according to Tim the Car Doctor!!
Thanks for the video Tim Glad you guys got it figured out before the straight jacket arrived
You might have just saved me fron a misdiagnosis. I was called to a body shop to diagnose a no com for the abs on a 2015 chevy tahoe. Everything looked good power, grounds and com lines. I called the module being bad 2 hrs ago. When I was looking up the abs diagram I couldn't find a wake up signal or a key on voltage. So I seen that enable com line wire and couldn't figure out what it was for. After Googleing "abs chevy no com, abs wake up" your video popped up. Thankfully there's awesome people like you to post gems like this. I could of hurt my reputation if I made the wrong call plus I would of been out a few bucks (my reputation is very important). I'll let you know tomorrow if it was that enable wire. I have a strong feeling it is because everything looked good.
What ended up being the issue?
@@JaysGarage6969 it was the abs module. I made the right call after all.
What a mission. At least it ended with a great video. Trust Eric to come up with the answer. Given the garbage that comes through his door he gets the opportunity to see more problems than you would.
Called Eric O huh Tim always nice when we can all help each other out
car doctor your the man eric o is the man and now car is fixed and we all work as one thats why i watch this this group of people snanner danner mr o car doctor pine hollow joes auto electrical omg keith is the boss of all of us his son we be taking over our jobs soon mr rock-o sorry if not spelled right thank you car doctor great vid jr reagan tn
Designed to fail. Both you and Eric are great guys. Thanks for the video.
More planned obsolescence from government motors
I have an '04 Express with the 1000 code for no communication. I bet this is the problem. I went through every ground, replaced the brake control module, and didn't know where to go from there. Started out with many codes. Now over 25K miles driven with just the one code left. Now I have something to go on! Thanks!
Eric O is the man! I've learned a lot from you both. Get Danner on the line and it will be the holy trinity.
Good job Doc. I an going through this right now. 02 Chev 2500HD. U1041 loss of comm to ebcm. I feel you. What a headache. Shows failure on supplemental inflatable restraint. Hoping to find bad data line connection between the two.
You just fixed my 2008 Silverado. Thank you
Thanks for the content Dr. its insane how these wires get damaged and then you have to find these splices all over the vehicle.
INSANE...is the state I was about at by the time it was finally fixed. Not sure im super impressed with GM's wiring and connectors lately. Good for business I guess. haha
Good work Tim glad you got it figured out and nice new laptop
Eric is a good dude. Talked with him before. Him and I live about 2.5 hour's from each other
Great walk through.
Eric O Great man to learn from also your video show 👏
hi tim....yea those abs modules go bad all the time can bus high and low and the wake up 12 v ...at chevy i just launched them in the attaching screws were a problem....you had a curve ball on this one! yea that dr o! hes from my neck of the woods....the man is good! if i called him dont think he would answer but at school ill get a chance to meet him
That's crazy this is the same problem I am having but with an 08 diesel 2500 van I have checked all the powers and grounds going to the ebcm they all will illuminate a headlight I have checked the data bus have 2.5 volts on all four of the communication wires my wake up signal was there died with a load I replaced the body control module and everything was programmed still would not wake up the ebcm so I am going to check this splice tomorrow thank you for the information this is very helpful
Let us know what you come up with. Good luck.
Great to see you tim
One must persevere in reaching the South Main state of enlightenment, to finally achieve the final pinnacle of "well, THERE'S your problem lady".
You are right Eric o is good watch him all the time
So my question is, how do you find that information about the LT Blue being a “wake up” signal. I have Mitchell ProDemend, but I can’t find that information anywhere.
Thank you for the video, I feel your pain.
No shame in phoning a friend...especially when your friend is Eric O!
indeed!
I have 2018 gmc with service stabilitrac lite on U0077, U0126, U0151. I have looked for the WB wire on the Drivers and passengers side sill plates also the rear spare tire area. Going to do some back probing tomorrow 😌
I think that's my problem after spending hundreds if dollars at various shops with no communication to EBCM which needed to be replaced. Now the new one needs to be programmed to suit my vehicle. After spending time at the GM dealership the Tech cannot communicate with the EBCM to do any programming. So that was a waste of my money for parts (new module that needs programming) and labour.
Now testing the blue wire on the third connection of Pcm I get no voltage with key on. Where would I go from here?
I will agree with you. Eric O does know his stuff. Good job fixing yours.
theres your problem lady...good vid..
What does it mean when you get a U0121 DTC every now and then in a car without ABS? There's no ABS module to communicate with! Logically you'd think the PCM would either set this code every time I turn the key on or, ideally, not at all, because it shouldn't be trying to communicate with a module that isn't there! Something must be triggering the PCM to look for an ABS module, but only on extremely rare occasions, but what would do that, and is there any way to fix it? It's really annoying when it does this, because I don't know why the engine light is on and have to take it seriously until I can get out my scan tool and check the code.
Good work
Don't you miss the gas, spark and air days?
Thanks Tim! Nice to have Eric O as your "phone a friend" option.
i was about ready to throw in the towel on this one.
Your the pkn man bro.
Thank you
Question being on the diagram I saw something related to the transmission I have code u1826-00 could this wiring issue (possible wire break) be the cause of my transmission acting up ?
That's one difficult problem to diagnose and fix, I am an auto mechanic with 30 years experience I have fix lot's of electronic electrical problems, I have taken a lot of fuel injection electronic courses and I am ASE certified. That's a very difficult problem to fix.
Agreed and thanks for the complement. We get lucky sometimes. Thanks for watching my vids!
Do you have a pinout diagram for a 2011 Chevrolet Express?
Thank you for the videos very helpful.
Glad you like them! Thanks for dropping by
I have brake light steering assist reduced stabli track off traction control off an abs light on what could it be on 2016 Silverado?
I am having the same issue with my Chevy Silverado, did you end up figuring this issue out?
Well I do have battery voltage at the blue wire on the blue BCM connection. Also tested the light blue wire at the EBCM connection harness grounding it to frame bolt and got the same battery voltage, so this wire is okay. But when grounded to heavy back wire on EBCM harness the meter showed 5 or 6 volts then settled down to .075 volt on either of the harness large black wires..Then this weird thing happened. Got a high 5 volts on the meter with only one black lead connected to the heavy black wire with red lead not connected to anything it showed a . I will need to try another multimeter when it's not so wet outside. Anyway the EBCM should be enabled with getting battery voltage on the light ble wire known on my schematic as serial data enabled. The two heavy black and red wires are getting full battery voltage when tested across the EBCM harness. I really thought this was used to operate the module, but maybe just the pump with internal connection. But why are there two two sets of each?
Getting back to enabling the EBCM
Is there a way that o can contact you, to explain my issue?
Im looking for an ABS Module for a 2013 GMC Savanna and the connecter. Mines got burnt.
Junkyard or dealership
Countless hrs finding the broken wire, 5 minutes fixing it. Happens to me all the time. Most mechanics would throw their hat in and send the customer to the "needs an computer" shop to be absolutely raped. Thank you for your persistence.
yes. IM sure there are some folks that would figure it our but this above most shops pay grade around here. It would have been more enjoyable if I wasnt totally slammed with work already. I did learn a lot.
I have problem with transmission on my GMC envoy 2009 model. It's jerks while changing 1st gear to 2nd gear. Computer shows the code P0717.00 input sensor circuit low voltage. I have reset that code. But after 2 days it's reappearing. Now what I have to do? Please guide me. Thanks
Probably should have it checked at a transmission shop.
@@ThecardoctorTV Thanks for your reply. Yesterday I have checked with transmission shop and they have told me to replace the valve body on the transmission box.
If anything Tim nice to see you,and the video nice....
Feel your pain about what to charge the customer, back when I had my own business (medical electronics) would end up writing off half the labor bill sometimes. Glad you were able go get some good help.
Chevy Express, GMC Savanna lost most of my hair working on them also.
hehehe
what state is your shop in?
I have the same problem on my chevy express.
Alaska. Would you like to schedule a day to bring it in?
@@ThecardoctorTV I would love to but it's too far for me I'm in Massachusetts, thank you for the answer.
@@alvarogomes3372 i can make you an appointment for the week after next and if you start driving now you should be able to make it. 😂 haha. Thank you for watching!
@@ThecardoctorTV 🤣ok let’s schedule
Persistence!
Careful, don't let it get to Eric Os head
Thank you Tim!!!
👍
Wow...some repairs will drive you crazy...
And that was a few repairs back for myself. It just keeps getting worse with every mess like this. haha
Eric often says ' Check the grounds and supplys ' , but Enable wires are another sneaky and easy missed signal.
Eric also says ' That's your problem lady ' even if the owner is a man!!, i think he needs glasses :-D.
Like yourself, eric is a decent man that looks after his customers.
There are too many greedy ripp off merchants thease days :-(
IM Glad he didnt tell me "theres your problem lady" hehe
👍👍🌟🌟🌟🌟👍👍
Interesting 🤔!
Here's your problem Lady! Good old GM wiring
haha yep
I freakin hate chasing wiring problems .
Its rewarding when you find it but can be a bit of a challenge getting there for sure. Glad this one is out of here
@@ThecardoctorTV Indeed , i bet you are . I can relate to the hair thing lol
You lost me as soon as you pulled out the wiring schematic... I'm watching a video for a reason, show me how to do it, don't show me a repair manual that shows me how to do it...
you need him warm up your milk and tuck you into bed too? i can tell ya got soft hands brother